A free (at least from what I can see, some sources say it's non-free in the same sense as well) alternative to Cube is Red Eclipse, in case you're interested.
You could probably look around and find .deb packages of Cube and Ryzom and go from there.
A free (at least from what I can see, some sources say it's non-free in the same sense as well) alternative to Cube is Red Eclipse, in case you're interested.
You could probably look around and find .deb packages of Cube and Ryzom and go from there.